Does anyone know of any standard symbol for a noise source, for example of one wants to represent the Johnson-Nyquist noise, what is best to use?
Electronic – standardised noise source symbol for circuit diagrams
diagramnoisesymbol [~]
Related Solutions
I'm not aware of a standard symbol for a pressure sensor.
Usually, it's drawn as an IC.
It's a good idea to indicate in the schematic that this is a sensor, and therefore something special. You can make a text block next to the symbol saying what the sensor is sensing. If you know what kind of sensing element the sensor is based on, you can draw an icon of the sensing element in the schematic symbol. If it's a MEMS pressure sensor like yours, you can draw a bridge on it. (Another example. If you know that some other sensor is based on a phototransistor, you can draw a phototransistor on it.)
According to Edraw: Standard Process Flow Diagram Symbols and Their Usage, it is the symbol for a pump.
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Best Answer
Many noise sources are best thought of as current noise, or voltage noise, and for those, just use a 'two circle' or 'single circle' current generator or voltage generator respectively, with an appropriate resistor if they have a finite impedance. When I've used a noise diode, I've used a diode symbol.
Putting a circle round a component is often quite a good hint that it's a 'bit more' than just a diode, or a voltage source.